8 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.18 



Lower posterior angle of coxa 1 with a tooth, of coxa 2 with a 

 small tooth; coxa 3 lacking a tooth. 



Gnathopod 1 : article 6 two thirds as long as 5, both lined poste- 

 riorly with strong setal spines; article 7 strong, two thirds as long as 

 article 6. 



Gnathopod 2: article 6 slightly more than one half as long as 

 article 5 ; article 7 about one half as long as 6. 



Peraeopod 1 : article 4 very slender, anterodistal angle not pro- 

 duced; article 7 longer than articles 5 and 6 combined. 



Peraeopod 2: article 4 rather slender, more setose than in peraeo- 

 pod 1 ; anterodistal edge of article 4 slightly produced. 



Peraeopod 3 : missing on both sides. 



Peraeopod 4 : article 6 almost as long as article 5 ; posterior edge 

 of article 6 with 2 spines, posterior edge of article 5 with 2 sets of spines. 



Peraeopod 5 : posterior lobe of article 2 obliquely rounded below, 

 reaching downward to junction between articles 4 and 5 ; article 3 

 slightly longer than 4; posterior edge of article 4 slightly produced, 

 setose ; articles 5 to 7 successively shorter, anterodistal edge of article 5 

 notched, article 6 rather narrow. 



Uropod 1 not reaching to end of uropod 2, rami slightly longer than 

 peduncle; outer edges of both rami weakly spinulate, inner edge of 

 inner ramus strongly spinulate. 



Uropod 2: outer ramus shorter than inner, apex of outer ramus 

 with a long spine ; both edges of rami strongly spinulate. 



Uropod 3: rami slender, lanceolate, subequal in size; inner margin 

 of inner ramus armed with spines, outer edge setose. 



Telson : lobes rather slender, apices truncate, notched, each armed 

 with 1 spine and 1 setule; dorsal surface of each lobe with 3 spinules. 



Pleon segment 3 : posterior edge slightly concave, posteroinferior 

 angle produced into a strong tooth. 



Pleon segment 4 : raised dorsally into a slightly convex process which 

 ends sharply above segment 5. 



Pleon segment 6: lateral ridges low. 



Male: Unknown. 



Type: Holotype, AHF no. 405, ovigerous female, 15 mm. 



Type locality: Station 1156-40, 6y 2 miles east of Long Point, 

 Santa Catalina Island, California, 230 to 280 fms. 



Material examined: The type. 



Remarks: This species resembles Ampelisca odontoplax Sars (1879) 

 but coxa 3 lacks a tooth, the head is not carinate, article 6 of gnathopod 



